Since I feel this version of the game is messed up... I didn't find the crystal sword in Harkyn's, for example... is there some way to modify the program so my characters can get a master key, and enter Mangar's Tower? It's frustrating, not being able to finish.

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Correction: I did get the crystal sword.

What probably happened is that all your characters' inventories were full, and so you were not able to pick up the Crystal Sword after defeating the Jabberwocky.
You are not the first one to which this has happened, so there is probably some info on how to fix it if google. Hex editing may be needed, which isn't too hard, as long as you know which values to change/add.

The Master Key is actually *in* Mangar's Tower; you need to find another way to reach the tower. Hint: Remember a certain early dungeon? One that the manual gave a hint about entering, and whose dungeon name changes between the first and second floors? The dungeon where you learned the name of the Mad God?

Also, if you are missing a key item, you should be able to find it again in the item's original location, even if you already had the item before; the game isn't smart enough to remember that you already picked it up.

(By the way, remember that the Mad God's name is not "burger". *evil laughter*)

I know how to reach Mangar's Tower through the sewer, but you can't enter it without first getting a key from Kylearan. Unfortunately, I can't return to K's tower (without cheating), since you can only go there once.... I didn't realize the Mad God didn't respawn.